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Objectives Overview Define system Describe the Summarize the software and identify functions of an startup process on a the two types of operating system personal computer system software Summarize the Summarize the Briefly describe features of several features of several various server stand-alone operating embedded operating operating systems systems systems Explain the purpose of several utility programsSee Page 397 Discovering Computers 2012: Chapter 8 2for Detailed Objectives

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System Software• System software consists of the programs that control or maintain the operations of the computer and its devices Operating Utility systems ProgramsPage 398 Discovering Computers 2012: Chapter 8 3

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Operating System Functions• The process of starting or restarting a computer is called booting Cold boot Warm boot • Turning on • Using the a computer operating that has system to been restart a powered off computer completelyPage 400 Discovering Computers 2012: Chapter 8 6Figure 8-2

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Operating System Functions A boot drive is the drive from which your computer starts •You can boot from a boot disk •A recovery disk contains a few system files that will start the computerPage 402 Discovering Computers 2012: Chapter 8 8

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Operating System Functions• An operating system includes various shut down options Sleep mode saves any open documents and programs to Hibernate saves any open RAM, turns off all unneeded documents and programs to functions, and then places a hard disk before removing the computer in a low- power from the computer power statePage 402 Discovering Computers 2012: Chapter 8 9

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Operating System Functions • A user interface controls how you enter data and instructions and how information is displayed on the screen • With a graphical user interface (GUI), you interact with menus and visual imagesPages 402 – 403 10 Discovering Computers 2012: Chapter 8Figure 8-4

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Operating System Functions• A performance monitor is a program that assesses and reports information about various computer resources and devicesPages 408 – 409 Discovering Computers 2012: Chapter 8 18Figure 8-11

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Operating System Functions • Some operating systems • A network are designed to work administrator uses the with a server on a server operating system network to: • A server operating – Add and remove users, system organizes and computers, and other devices coordinates how – Install software and multiple users access administer network and share resources on security a networkPage 410 21 Discovering Computers 2012: Chapter 8

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Utility Programs• A search utility is a program that attempts to locate a file on your computer based on criteria you specifyPage 422 Discovering Computers 2012: Chapter 8 37Figure 8-29

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Utility Programs • An image viewer allows users to display, copy, and print the contents of a graphics file • An uninstaller removes a program, as well as any associated entries in the system filesPage 423 38 Discovering Computers 2012: Chapter 8Figure 8-30

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Utility Programs A virus describes a potentially damaging computer program that affects a computer negativelyA worm copies A Trojan horse An antivirus itself hides within or program repeatedly in looks like a protects a memory or legitimate computerover a network program against virusesPages 425 - 426 Discovering Computers 2012: Chapter 8 43

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Utility Programs Spyware is a program placed on Adware displays an online a computer without the user’s advertisement in a banner or knowledge that secretly collects pop-up window information about the user• A spyware remover detects • An adware remover is a and deletes spyware and program that detects and other similar programs deletes adwarePage 426 Discovering Computers 2012: Chapter 8 45